jlaitine opened a new pull request, #19886:
URL: https://github.com/apache/nuttx/pull/19886
## Summary
Add a flag to drop SHM object cache alignment. This can be used on small
systems to save RAM if the SHM object doesn't need to be cache-aligned. On a
CONFIG_BUILD_FLAT, saves ~24 bytes per object.
## Impact
No impact on existing boards, added configuration flag to save some RAM on a
system using lots of SHM objects.
## Testing
With my custom SW, having a few hundred SHM objects on a Pixhawk 5x
(stm32f7) HW, CONFIG_BUILD_FLAT:
CONFIG_FS_SHMFS_NO_ALIGN=y:
```
nsh> cat /proc/meminfo
total used free maxused maxfree nused nfree name
419860 383948 35912 386392 33688 1600 4 Umem
2097152 2097152 0 0 13 0 Prog
```
CONFIG_FS_SHMFS_NO_ALIGN=n:
```
nsh> cat /proc/meminfo
total used free maxused maxfree nused nfree name
419796 387964 31832 387688 31744 1542 5 Umem
2097152 2097152 0 0 13 0 Prog
```
So the RAM saving gets up to ~5kB
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